[R] Compute quantiles with values and correspondent frequencies

[Paolo Radaelli]

Yes, but it works only when you have integer counts for each value.
When I have only relative frequencies I can't repeat each value a
non-integer number of times.
Paolo

----- Original Message ----- 
From: "Roger Bivand" <Roger.Bivand at nhh.no>
To: "Paolo Radaelli" <paolo.radaelli at unimib.it>
Cc: <r-help at stat.math.ethz.ch>
Sent: Friday, March 03, 2006 1:18 PM
Subject: Re: [R] Compute quantiles with values and correspondent frequencies


> On Fri, 3 Mar 2006, Paolo Radaelli wrote:
>
> > Dear List, quantile(x) function allows to obtain specified quantiles of
> > a vector of observations x.
> >
> > Is there an analogous function to compute quantiles in the case one have
> > the vector of the observations x and the correspondent vector f of
> > relative frequencies ?
>
> Just use rep():
>
> x <- rpois(100, 4) # data
> quantile(x)
> tx <- table(x) # frequencies (need to be integer counts)
> tx
> v <- as.numeric(names(tx)) # values
> quantile(rep(v, as.integer(tx)))
>
> You have v and tx, so this should work.
>
> >
> > Thank you
> >
> > Paolo Radaelli
> >
> >
> >
> > [[alternative HTML version deleted]]
> >
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>
> -- 
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Helleveien 30, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
> e-mail: Roger.Bivand at nhh.no
>